No color

it is not the color the system is messed up. it is the same prob wth mine

go to ur menu screen and adjust ur coloring! set it to tha color of ur satisfation!

I had the same problem with a PS2 connected to a small Sanyo TV. To fix it, while the game was playing I pressed a button on the remote control adjacent to an icon that resembles a square with a black dot in the bottom right hand corner. On my remote the button is directly behind the TV/AV button. As you press the button, one press at a time, this takes you through the various video format options available, including PAL, NTSC, Auto etc. When you reach the correct format the colour will return to your game.
In my case, I suspect this button was accidentaly pressed instead of the TV/AV button.
I hope this helps someone else as the problem had driven me mad all day before I stumbled over the solution.
Bob